Euclid anderson



(No Model.) B. ANDERSON,

RATGHET DRILL.

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NlTE STATES EUCLID ANDERSON, or PEEKSKILL, NEW YORK.

RATCHET-DRILL.

PECIPIGATION forming part of Letters Patent No. 316,321, dated. April 21, 1885.

Application filed November 28, 1834. (No model.) 7

To aZZ whom it may concern:

Be it known that I, EUcLin ANDERSON, a citizen of the United States, residing at Peekskill, in the county of Westchester and State of New York, have invented an Improvement in Ratchet-Drills, of which the following is a specification.

This invention relates to selfffeeding ratchet-drills, and is a modification of the kind in which a differential ratchet is used to effect the feed.

In said devices as heretofore used the feed is apt to be very irregular, because uniformity of feed depends on the relative position of the pawls at the beginning of the stroke, forif the feed-pawl does not fall into its place in ad- Vance of the drill-pawl either no feed or only a slight feed (according as the teeth in the ratchet are coarse or fine) occurs; hence it is necessary to watch the ratchets at every stroke to secure regularity, and therefore if the drill is used in a position where the pawls cannot be seen, the feed action is very uncertain.

The main object of my invention is to provide a feeding device that will be positive and proportional to the movement of the drill, no matter how great or little the throw of the ratchet; and a secondary object is to have the feed so arranged that it can be operated independently of the feeding device, the same as in the old form of drill. I attain these objects, the first by using instead of differential ratchets, differential gearing, in combination with the drill-ratchet, and the: second by adding a milled collar to the threaded sleeve forming the nut, all of which is more clearly shown in the accompanying drawings, in which- Figure 1 is a side view, partly sectional, of a drill embodying my invention. Fig. 2 is an end view of the left-hand end of Fig. 1. Fig. 3 is a view of the right-hand end of Fig. 1 with the part 0 G, sleeve F, and screw E removed.

. Similar letters refer to similar parts through out the drawings.

A is the drill-spindle.

B is'the handle or lever, which at one end is formed into the yoke B O, the part 13 forming the bearing for the spindle A.

D is the drill-ratchet rigidly attached to A, and operated by the pawl d and spring S in the usual manner.

F is a threaded sleeve in line with the spindle A, and having bearing in the branch 0 G of the yoke. This sleeve abuts against the spindle, and through it passes the screw E, whose outer end is provided with a suitable center, and whose inner end enters a chamber in the spindle A. The spindle and screw are splined together, as in other drills of this class.

On a boss of the spindle and adjacent to ratchet D is rigidly secured the spur-wheel I, which forms the driver of the differential movement.

J is the intermediate and H is the driven spur-wheel. The latter is either formed on or rigidly fastened to the sleeve F, which forms the nut. The intermediateJ finds bearing on the pin K, on which also it is capable of lateral movement, by which means it may be slid into or out of mesh withthe driver I, in either case remaining in mesh with wheel H. To retain the intermediate in either of its positions it is provided with a hub, in which is-formed the groove a, leaving the flange m. When J is out of mesh with I, as in Fig. 1, a lever, j, pivoted at i, is pushed into the groove 11, as in Fig. 1, and holds the intermediate in said position. When. the intermediate is in its other position,the1ever j will enter behind the flange m and retain J, as shown in Fig. 3.

For convenience of construction I make the yoke B O in two parts and clamp them toget-her by the bolt 0.

On the outer end of thelthreaded sleeve F, I form a place or collar, G, which is coarsely milled for hand use or drilled for a spanner, or both, by which the screw can be worked in or out independently of the gearing, when I and J are disengaged, as in position of Fig. 1.

The use of differential gearing indrills not being new, it will not be necessary to explain their action; but what has been shown of their employment here will make it clearly seen that with this arrangement, so long as the spur-wheels are all in gear,.no movement forward of the drill-ratchet or driving device can take place without aproportionate advance of the feed. No matter,therefore,how long or how short the throw of the handle, the feed must be uniform.

- If it is necessary to advance or retract the screw, the intermediate J is shifted laterally till it is out of mesh with I, and then by means of the collar G the screw may will.

I make no claim to the threaded sleeve and splined screw and spindle; neither do I claim the use of differential gear for actuating drillfeed, as I am aware of its use in connection with a traversing threaded spindle, as in several patents and in one to myself, No. 271,290; but I am not aware of its previous use in connection with a ratchet-spindle and splined feed-screw.

What I claim, and desire to secure by Letters Patent, is-

1. In a ratchet-drill, the combination, with the splined spindle and screwAEand threaded sleeve F, of the differential spur-wheels H be worked at I I J, one attached to the spindle, one attached EUCLID ANDERSON. \Vitnesses:

ALLEN BARGER, I ANDERSON.

G, for 25 

